Improvement in knitting-machine burrs



NITED STATES PATENT OFFICE.

HoRAoE FISHER, oF wArEEFoEH-NEW YORK.

IMPROVEMENT IN KNITTING-MACHINE BUaas.

Specification forming part of Letters Patent No. 40,679, dated November 24, 1863.

To all whom it may concern:

Be it known that I, HORACE FISHER, of the town of Waterford, Saratoga county, State of New York, 'have invented a new and useful method of constructing that part of' the apparatus known as burrs in knitting Inachinery; and I declare the following specification, with the drawings forming part of' the same, to be a full and complete description of my invention.

The knitting-burr is a well-known part of the machinery of' knitting-looms employed in the formation ofthe stitch, and is constituted, as shown in Figure l, of a small metal cylinder or roller, A, prolonged into a neck, B, with an orifice through its axis through which, when in the machine, a fixed axle passes, upon which it revolves. Across the face of the cylinder oblique slots a a are cut, and into these slots are inserted wings of thin metal shaped like C, the apparatus, when completed, appearing in profile, as shown in Fig. 2, and in end view like Fig. 3.

Persons conversant with the operation of knitting-looms know that from the necessarily delicate character of' their machinery and the very great velocity of' its movements the derangement and breakage of' burrs is a matter of frequent occurrence.

lt will be perceived from the above description that in the burr as usually made the wings are so attached to thevcylinder that in case of injury to one or more of them, it must be a very difficult thing to detach and replace them with others, and that in most instancesl of' such injury it becomes necessary to un-A solder the entire set of' wings, and then replace the whole and the fact is, that in most of such cases the burr is of' necessity sent to the manufacturers work-shop to be repaired. To avoid this trouble and to enable the knitter to repair promptly an injured burr has been the subject of some inventions, and to accomplish this in an improved manner is the object of' my invention, which is shown in Fig. 4, being a representation of' its separate parts in perspective, and Fig. 5, the same in cross-section through its axis, with the parts all in place. Fig. 6 is a plan of one of' the wings and its connection with the cylinder.

Similar letters denotein the ii gures the same parts of the apparatus.

H is a cylindrical hub,into which the win gs are to be secured, similar externally to that shown in Fig. 1, but having a smooth instead of grooved face. The interior is turned out cupwise, so as to leave a thin shell or rim as its periphery, the neck B being bored for the passage of a shaft through it. Through the rim oblique slots a a are cut to receive the wings. These slots are not cut entirely through the rim from front to rear, but part of' the way, (as shown in an enlarged diagram, Fig. 6, of' a section of the cylinder in the line of the slot,) from .fr to y, and then from y to z only half-way down through the rim. The wings are shaped as shown at Fig. 7, and are punched out of' thin steel. They have each a slot, e, in their back edges fitted to slide snugly upon the uncut part of the rim from y to z, and their lower edges are out with a diagonal sheer, the outer corner being even with the inner edge of the rim, but the inner corner extending down to near the edge of the bore through the neck at t, so that when all the wings are in place their lower edges form the bounds of' a conical chamber.

P is a center-pin, fitted to pass snugly through the orifice in the neck B. Its outer end is formed of a conical shape, and so tted that when every wing is in its seat and itself in place its conical surface lshall bear truly against the diagonal lower edges'of the wings and hold them exactly and firmly in their place. Upon the back end of' the pin is a screw-thread and a nut, N, to draw and hold it firmly against the wings. The pin has an orifice through its axis to receive the axle on which the burr revolves in the knitting-machine.

From the construction of' this apparatus it will be manifest that any one or more of the defective wings can be removed and replaced by perfect ones simply by taking out the pin P, and, when the change is effected, securing it again in its place, and that it is only requisite to keep on hand spare wings to be freed from the trouble and expense attendant upon the repairing of' burrs with fixed wings, as described in the first part of this specification. It will also be perceived that in case of' the loosening of the wings from any cause the screwing up of' the pin will remedy that defect.

An important advantage is obtained in the use of the hollow pin P as the axis on which the burr revolves. With any of' the kinds of the pin can be cheaply replaced.

WhatI claim as my invention, and desire to secure by Letters Patent, isl n 1. Wings W, shaped as described, with slots e adapted to it the rim ofthe box-shaped hub, and the conical head pcf the pin.

2. The conical center-pin P p, fitted to the said wings so as to hold them firmly in place when screwed up, and with its central bore for the axis on which the burr revolves.

3. The combination of the wings, centerpin, and box-shaped hub, substantially as described, and for the purposes set forth in this specification. n

HORACE FISHER. Witnesses:

- E. J.- MILLER. Y

Rioni). VARICK DEWITT. 

